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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02d0ca80fc966ed5b36cee1f01dbb0a53528aeb372926ffe04ff74eb24b29f4' 
  AND token = 'bC50AhsAyU3knqc1K1QN6XVIUBDtwQ7GHGNOP0q54/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}